NSSF Twin Towers Construction Progress: Raft Foundation Casting Underway as Piling Continues

Aerial photographs obtained by Kenyans.co.ke show the National Social Security Fund's (NSSF) Twin Towers project has advanced beyond excavation and into the heavy structural foundation stage at its Nairobi site.

The images indicate deep excavation work is now in its final stage, stabilised using reinforced retaining walls that allow crews to operate safely several metres below ground level.

Large sections of a raft foundation have already been cast on one side of the site, with multiple foundation pits, column starter positions and service chambers visible in the photographs.

Ongoing works with raft foundation casting completed in one section. /Kenyans

A raft foundation is a large reinforced concrete slab that spreads a building's weight across its entire footprint, reducing soil pressure and preventing uneven sinking of the structure.

This particular slab is designed to distribute the substantial vertical and lateral loads generated by the two towers once construction moves above ground.

At the centre of the site, piling rigs and crawler cranes remain active, indicating ongoing piling and foundation reinforcement work in sections yet to receive the raft slab.

Ongoing piling works. /Kenyans

Concrete pumps, excavators and earthmoving equipment were also present, pointing to simultaneous excavation, backfilling and structural works across different parts of the site.

Compared to earlier architectural renderings of the towers, current activity remains focused entirely on underground engineering elements that will determine the structure's long-term stability.

This construction phase follows regulatory approvals and Environmental Impact Assessments from the National Environment Management Authority (NEMA) and the National Construction Authority (NCA).

NSSF unveiled plans for the Ksh30 billion (approximately $232 million) twin-tower development at the junction of Uhuru Highway and Kenyatta Avenue in Nairobi between January and February this year.

Renders for the twin towers. /Kenyans

The mixed-use project comprises a 60-storey and a 35-storey tower and is projected for completion between late 2028 and early 2029.

Once complete, the towers are expected to become one of the most prominent additions to Nairobi's skyline, situated at one of the city's busiest road junctions.